@RehanBhatti
So here is the update!
Today 1 drove my car on motorway around 750Kms from punjab till balochistan. I enjoyed my ride alot. AC was full time on with much much better cooling this time. I noted temp on my wrist watch n it was 40°C outside after bahawalpur onwards. I did not feel any fuel smell inside passenger cabin. There was no jerking at all even during idle rpm while stopping at toll plazas. I did not push gas paddle hard but still 120kmph was easily manageable. It might have gone higher but i did not try full gas paddle.
In short this setting has worked for me and will also be helpful to all those who will read this thread.
Note: I felt this problem last year at the end of summers. This year I was facing same problem since start of spring n early summers so I only changed position of those 2 pipes as shown above n problem has been solved. Now have a look on all those measures which I took last year which were absolutely fruitless!
- Inspected my fuel tank cap n found it f9. I did not make any hole in fuel cap rubber but tried to lose it as many people suggest on other threads. Useless!
- Went to mechanic, got my fuel tank inspected for any blockage n had it throwly washed. But it was useless again.
- Got my car's charcoal canister box cleaned as well. It was useless once again.
- People also suggested about some sort of pipe behind rear left brake light which is not upto proper lenght, or there may be blockage there, I even tried that but end was same..... no result.
- Got inspected from suzuki showroom and they had no clue but a long list of items to be replaced (Pathetic Suzuki staff) without knowing actual problem. Thankfully I did not accept what they said!
Conclusion:
Just change those 2 pipes, save money n time, remember me in your prayers n enjoy tension free ride 
